请教：补充250-18

18.   Aging is a property of all animals that reach a fixed size at maturity, and the variations in life spans among different species are far greater as that among individuals from the same species: a fruit fly is ancient at 40 days, a mouse at 3 years, a horse at 30, a man at 100, and some tortoises at 150.

(A) among different species are far greater as that among individuals from

(B) among different species are far greater than that among individuals from

(C) among different species are far greater than those among individuals of

(D) between different species are far more than that between individuals of（C）

(E) between different species are greater by far than is that between individuals from

Choice A is incorrect on several grounds: greater as should be greater than, that should be those to agree in number with its referent, variations, and from should be of. Choice B amends only the first error. Choice C is the best answer. In D, between is faulty because many more than two species are being considered, more illogically refers to the quantity rather than the size of variations in life span, and that does not agree with variations. Besides including between, that, and from, choice E is needlessly wordy and lacks agreement in verb number. This question is moderately easy.

不明白这句解释是什么意思啊？

这句的意思是

1. between错误，因为是两者以上，所以用among.
2. 使用more, 比较的是variations的数量的多少，而不是variations的长度, 所以应该用greater. (解释里的more应该是斜体。)
3. that作为单数不能指代variations, 所以应该用those.

明白了。毛病就出在这个more没有斜体，我还以为ETS在说什么between和among有这样的区别，吓一跳！：）谢谢了！